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Fixes #7407
Solr 8 is only receiving critical security fixes, and Solr 9 is the currently supported version (9.2.x)
There are no code or schema changes needed to support Solr 9. I reviewed the upgrade notes and didn't see anything that stood out for a standard CKAN install:
https://github.com/apache/solr/blob/main/solr/solr-ref-guide/modules/upgrade-notes/pages/major-changes-in-solr-9.adoc
There are pre-configured images for CKAN + Solr 9 ready to go:
ckan/ckan-solr#6
I've been using Solr 9 locally for a long time and didn't have any issues at all. I also set up automated tests for all the CKAN / Solr versions combinations so we can keep an eye on the tests (see PR above for details).
The
ckan/ckan-solr:master
image will now be built using Solr 9, so the Circle CI tests will use Solr 9